Size Guide
| US |
Internal Diameter, mm |
Circumference, mm | France | Italy | Germany |
| 5 | 15.7 | 49.3 | 49.5 | 9.25 | 15.75 |
| 5 1/2 | 16.1 | 50.6 | 50.5 | 10.5 | 16 |
| 6 | 16.5 | 51.9 | 52 | 12 | 16.5 |
| 6 1/2 | 16.9 | 53.1 | 53 | 13 | 17 |
| 7 | 17.3 | 54.4 | 54.5 | 14.5 | 17.25 |
| 7 1/2 | 17.7 | 55.7 | 56 | 16 | 17.75 |
| 8 | 18.1 | 57 | 57 | 17 | 18 |
| 8 1/2 | 18.5 | 58.3 | 58.5 | 18.5 | 18.5 |
